checkout the highlights:
Making Android for everyone
Android 4.4 is designed to run fast, smooth, and responsively on a much broader range of devices than ever before — including on millions of entry-level devices around the world that have as little as 512MB RAM.
New NFC capabilities through Host Card Emulation
- Printing framework
- Storage access framework
- Low-power sensors
- SMS provider
- New ways to build beautiful apps
- New media capabilities
Remaining i will update soon...